Numerical Simulation of Flow and Heat Transfer Performance of Segmental Baffle Heat Exchanger
In order to study the influence of the segmental baffle structure on the overall performance of shell and tube heat exchangers,FLUENT software was used to simulate and analyze the influence of two key variables of distance between segmental baffles and notch height ratio,and distribution of flow field and temperature field under different conditions was obtained.Taking the heat transfer coefficient h,pressure drop ΔP and comprehensive performance parameter η as heat transfer evaluation index,the influence of different structural parameters on heat transfer performance was studied,and the correlation between the two key variables was analyzed.The results show that the dead zone of flow and heat transfer becomes smaller and the heat transfer coefficient and shell side pressure drop increase with the decrease of distance between segmental baffles.The comprehensive performance of the heat exchangers with smaller distance between baffles is relatively better under the condition of low inlet velocity.The heat transfer coefficient and pressure drop decrease with the increase of the notch height ratio when the distance between segmental baffles is 185 mm,so the better comprehensive performance can be obtained by choosing the notch height ratio of 0.30.In addition,by studying the relationship between the two variables,it is found that when the distance between baffles is small,a relatively larger notch height ratio should be selected to ensure its better performance.
shell and tube heat exchangersegmental baffleheat transfer performanceflow performanceFLUENT
国家科技期刊平台
NSTL
万方数据
